<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片区域 -->
    <el-card>
      <!-- 警告区域 -->
      <el-alert
        title="注意：只允许为第三级分类设置相关参数！"
        type="warning"
        show-icon
        :closable="false"
      >
      </el-alert>

      <!-- 级联选择器区域 -->
      <el-row class="cat_opt">
        <el-col>
          <span>选择商品分类：</span>
          <el-cascader
            v-model="selectCateKeys"
            :options="cateList"
            :props="cateProps"
            @change="handleChange"
          ></el-cascader>
        </el-col>
      </el-row>

      <!--页签区域  -->
      <el-tabs v-model="activeName" @tab-click="handleTabClick">
        <!-- 动态参数区域 -->
        <el-tab-pane label="动态参数" name="many">
          <el-button
            type="primary"
            size="mini"
            :disabled="isBtnDisabled"
            @click="addDialogVisible = true"
            >添加参数</el-button
          >
          <el-table :data="manyTableData" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!-- 参数标签 -->
                <el-tag
                  closable
                  v-for="(item, i) in scope.row.attr_vals"
                  :key="i"
                  @close="handleClose(i, scope.row)"
                  >{{ item }}</el-tag
                >
                <!-- 动态添加参数标签 -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <!-- 添加参数的按钮 -->
                <el-button
                  v-else
                  class="button-new-tag"
                  size="small"
                  @click="showInput(scope.row)"
                  >+ New Tag</el-button
                >
              </template>
            </el-table-column>
            <el-table-column type="index"></el-table-column>
            <el-table-column
              label="参数名称"
              prop="attr_name"
            ></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button
                  type="primary"
                  size="mini"
                  icon="el-icon-edit"
                  @click="showEditDialog(scope.row.attr_id)"
                  >编辑</el-button
                >
                <el-button
                  type="danger"
                  size="mini"
                  icon="el-icon-delete"
                  @click="removeParams(scope.row.attr_id)"
                  >删除</el-button
                >
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>

        <!-- 静态属性区域 -->
        <el-tab-pane label="静态属性" name="only">
          <el-button
            type="primary"
            size="mini"
            :disabled="isBtnDisabled"
            @click="addDialogVisible = true"
            >添加属性</el-button
          >
          <el-table :data="onlyTableData" border stripe>
            <!-- 静态属性展开行 -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!-- 参数标签 -->
                <el-tag
                  closable
                  v-for="(item, i) in scope.row.attr_vals"
                  :key="i"
                  @close="handleClose(i, scope.row)"
                  >{{ item }}</el-tag
                >
                <!-- 动态添加参数标签 -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <!-- 添加参数的按钮 -->
                <el-button
                  v-else
                  class="button-new-tag"
                  size="small"
                  @click="showInput(scope.row)"
                  >+ New Tag</el-button
                >
              </template>
            </el-table-column>
            <el-table-column type="index"></el-table-column>
            <el-table-column
              label="属性名称"
              prop="attr_name"
            ></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button
                  type="primary"
                  size="mini"
                  icon="el-icon-edit"
                  @click="showEditDialog(scope.row.attr_id)"
                  >编辑</el-button
                >
                <el-button
                  type="danger"
                  size="mini"
                  icon="el-icon-delete"
                  @click="removeParams(scope.row.attr_id)"
                  >删除</el-button
                >
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>

    <!-- 添加参数的对话框 -->
    <el-dialog
      :title="'添加' + titleText"
      :visible.sync="addDialogVisible"
      width="50%"
      @close="addDialogClosed"
      ><el-form
        :model="addForm"
        :rules="addFormRules"
        ref="addFormRef"
        label-width="100px"
      >
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input> </el-form-item
      ></el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button>
      </span>
    </el-dialog>

    <!-- 编辑参数的对话框 -->
    <el-dialog
      :title="'编辑' + titleText"
      :visible.sync="editDialogVisible"
      width="50%"
      @close="editDialogClosed"
      ><el-form
        :model="editForm"
        :rules="editFormRules"
        ref="editFormRef"
        label-width="100px"
      >
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input> </el-form-item
      ></el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParams">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  name: "Params",
  data() {
    return {
      // 商品分类列表
      cateList: [],
      // 级联选择器的配置对象
      cateProps: {
        expandTrigger: "hover",
        value: "cat_id",
        label: "cat_name",
        children: "children",
      },
      // 级联选择器双向绑定到的数组
      selectCateKeys: [],
      // 默认选中的页签
      activeName: "many",
      // 动态参数信息
      manyTableData: [],
      // 静态属性信息
      onlyTableData: [],
      // 控制添加参数对话框的显示与否
      addDialogVisible: false,
      // 验添加参数单的数据
      addForm: {
        attr_name: "",
      },
      // 添加参数的验证规则
      addFormRules: {
        attr_name: [
          { required: true, message: "请输入参数名称", trigger: "blur" },
        ],
      },
      // 控制修改参数对话框的显示与隐藏
      editDialogVisible: false,
      // 编辑参数的表单
      editForm: {
        attr_name: "",
      },
      // 编辑表单的验证规则
      editFormRules: {
        attr_name: [
          { required: true, message: "请输入参数名称", trigger: "blur" },
        ],
      },
    };
  },
  computed: {
    // 控制按钮是否显示
    isBtnDisabled() {
      if (this.selectCateKeys.length > 0) return false;
      return true;
    },

    // 获取三级分类的id
    cateId() {
      if (this.selectCateKeys.length == 3) return this.selectCateKeys[2];
      return null;
    },

    // 动态决定添加参数对话框的标题
    titleText() {
      if (this.activeName == "many") return "动态参数";
      return "静态属性";
    },
  },
  methods: {
    // 获取商品分类列表
    async getCateList() {
      const { data: res } = await this.$http.get("categories");
      if (res.meta.status !== 200)
        return this.$message.error("获取商品分类失败");
      this.cateList = res.data;
    },

    // 级联选择器触发事件
    handleChange() {
      this.getParamsData();
    },

    // 点击页签触发的事件
    handleTabClick() {
      this.getParamsData();
    },

    // 获取参数列表
    async getParamsData() {
      if (this.selectCateKeys.length !== 3) {
        this.selectCateKeys = [];
        this.manyTableData = [];
        this.onlyTableData = [];
        return;
      }
      const { data: res } = await this.$http.get(
        `categories/${this.cateId}/attributes`,
        { params: { sel: this.activeName } }
      );
      if (res.meta.status !== 200)
        return this.$message.error("获取参数列表失败");
      res.data.forEach((item) => {
        item.attr_vals = item.attr_vals ? item.attr_vals.split(" ") : [];
        // 为每个展开行单独设置属性
        item.inputVisible = false;
        item.inputValue = "";
      });
      if (this.activeName == "many") {
        this.manyTableData = res.data;
      } else {
        this.onlyTableData = res.data;
      }
    },

    // 监听添加参数对话框关闭
    addDialogClosed() {
      this.$refs.addFormRef.resetFields();
    },

    // 添加参数
    addParams() {
      this.$refs.addFormRef.validate(async (valid) => {
        if (!valid) return;
        const { data: res } = await this.$http.post(
          `categories/${this.cateId}/attributes`,
          {
            attr_name: this.addForm.attr_name,
            attr_sel: this.activeName,
          }
        );
        if (res.meta.status !== 201) return this.$message.error("添加参数失败");
        this.$message.success("添加参数成功");
        this.getParamsData();
        this.addDialogVisible = false;
      });
    },

    // 控制编辑对话框的显示与否
    async showEditDialog(attrId) {
      const { data: res } = await this.$http.get(
        `categories/${this.cateId}/attributes/${attrId}`,
        {
          params: this.activeName,
        }
      );
      if (res.meta.status !== 200)
        return this.$message.error("获取参数名称信息失败");
      this.editForm = res.data;
      this.editDialogVisible = true;
    },

    // 监听修改参数对话框的关闭
    editDialogClosed() {
      this.$refs.editFormRef.resetFields();
    },

    // 发起修改参数的请求
    editParams() {
      this.$refs.editFormRef.validate(async (valid) => {
        if (!valid) return;
        const { data: res } = await this.$http.put(
          `categories/${this.cateId}/attributes/${this.editForm.attr_id}`,
          {
            attr_name: this.editForm.attr_name,
            attr_sel: this.activeName,
          }
        );
        if (res.meta.status !== 200)
          return this.$message.error("更新参数名称失败");
        this.$message.success("更新参数名称成功");
        this.getParamsData();
        this.editDialogVisible = false;
      });
    },

    // 删除参数
    async removeParams(attrId) {
      const confirmResult = await this.$confirm(
        "此操作将永久删除该参数, 是否继续?",
        "提示",
        {
          confirmButtonText: "确定",
          cancelButtonText: "取消",
          type: "warning",
        }
      ).catch((error) => error);

      //用户点击确认，confirmResult值为confirm
      if (confirmResult !== "confirm") return this.$message.info("已取消删除");

      const { data: res } = await this.$http.delete(
        `categories/${this.cateId}/attributes/${attrId}`
      );
      if (res.meta.status !== 200) return this.$message.error("删除参数失败");
      this.$message.success("删除参数成功");
      this.getParamsData();
    },

    // tag文本框失去焦点、回车触发
    handleInputConfirm(row) {
      // 输入不合法时，情况文本框
      if (row.inputValue.trim().length == 0) {
        row.inputValue = "";
        row.inputVisible = false;
        return;
      }

      row.attr_vals.push(row.inputValue.trim());
      row.inputVisible = false;
      row.inputValue = "";
      // 发起请求
      this.saveAttrVals(row);
    },

    // 将attr_vals保存到数据库中
    async saveAttrVals(row) {
      const { data: res } = await this.$http.put(
        `categories/${this.cateId}/attributes/${row.attr_id}`,
        {
          attr_name: row.attr_name,
          attr_sel: row.attr_sel,
          attr_vals: row.attr_vals.join(" "),
        }
      );
      console.log(res);
      if (res.meta.status !== 200) return this.$message.error("修改参数项失败");
      this.$message.success("修改参数项成功");
    },

    // 点击按钮触发
    showInput(row) {
      row.inputVisible = true;
      // 让文本框自动获取焦点
      this.$nextTick((_) => {
        this.$refs.saveTagInput.$refs.input.focus();
      });
    },

    // 处理tag标签关闭事件
    handleClose(i, row) {
      row.attr_vals.splice(i, 1);
      this.saveAttrVals(row);
    },
  },
  created() {
    this.getCateList();
  },
};
</script>

<style lang="less" scoped>
.cat_opt {
  margin: 15px 0;
}

.el-tag {
  margin: 10px;
}

.input-new-tag {
  width: 120px;
  margin: 10px;
}

.button-new-tag {
  margin: 10px;
}
</style>